Gankoomon

When Digivolving You may play 1 Huckmon or 1 Digimon card with Sistermon in its name in your trash without paying its memory cost.

Your Turn Once Per Turn When you play another Digimon by an effect, De-Digivolve 1 up to 2 of your opponent's Digimon. (Trash 1 card from the top of one of your opponent's Digimon. If it has no digivolution cards, or becomes a level 3 Digimon, you can't trash any more cards.)